Re: LF: OT, Remote site, garden progress, Solar battery charger

[DK7FC <73dk7fc@googlemail.com>]

Hi all,

Since today, my solar powered battery in the garden is charged by this 
solar battery charger, 
https://dl.dropboxusercontent.com/u/19882028/20140927_004153.jpg
It took some time until i found the circuit that suits my requirements. 
The losses are very low! The supply current of the circuit is just 40 
uA!. The circuit is a comparator design which generates no QRM during ON 
and OFF times. The switching transients are relatively slow (not like in 
usual switch mode supplies). The hysteresis causes a switch-off voltage 
of 13.9V and a switch-on voltage of 13.3V. The high current diode which 
is a very low forward voltage drop is taken from an old SMPS...
Just in case someone want to play with similar stuff and likes to have 
some ideas...
73, Stefan/DK7FC

PS: Yes yes yes, of course the may be similar circuits in the web and 
someone has done it before. But it wasn't the goal to do something the 
first time, as usual :-)